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If you will be deploying Connect Daily as part of a cluster, you should know that if the container does not persist sessions between different members of the cluster, it must ensure that for each User all requests in their session must be directed to the same server.
We recommend that if you will be running Connect Daily in a clustering environment that you manually add the configuration setting:
ClusterMaster=<master host name>
to the WEB-INF/configuration.properties. Replace <master host name> with the host name of the master computer in the cluster. It doesn't really matter which computer in the cluster is named, just name one. This will ensure that only the cluster master computer starts background processing threads. If you don't set this, then each member of the cluster will send out notifications and reminders.
If you're having a problem with the ClusterMaster configuration option, check the server logs. If this item is present, Connect Daily will report the name of the master, and the name of the executing computer at startup. Make sure that they match for the computer you wish to be the master.